McDonald’s Big Mac’s special sauce has been a well-kept secret for decades.

But on Thursday McDonald’s is giving away 10,000 limited edition 11.4 ounce bottles of the sauce at select McDonald location across the country.

The fast-food giant chose three in Michigan and the giveaway is said to be part of its new Grand Mac and Mac Jr. burgers.

Quantities of the bottles of sauce will vary at each location. There is a limit of 1 per customer on a first come, first serve basis while supplies last and no purchase is required. The number of bottles available at each location was not revealed.

These Michigan McDonald’s will be giving away bottles of Big Mac Special Sauce on Thursday.

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